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LM5143-Q1: Internal VDD +5V not generated

Part Number: LM5143-Q1
Other Parts Discussed in Thread: LM5143

 I'm using LM5143 to generate single output (28Vin to 12Vout @ 30A). No internal VDD +5V generated. Grounded VCCX pin. During input voltage fall transient +5V raised at that instant. Continous LM5143 IC failure was observed.

CH1- +28V input voltage

CH2- +5V Internal VDD.

lm5143.jpg